blob: 3c5e88bfecf1bc3d00e2de16fc4c31720406a8fe [file] [log] [blame]
Sam Ravnborgf77bf012007-10-15 22:25:06 +02001# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007# Figure out what we need to build from the various variables
8# ===========================================================================
9
10# When an object is listed to be built compiled-in and modular,
11# only build the compiled-in version
12
13obj-m := $(filter-out $(obj-y),$(obj-m))
14
15# Libraries are always collected in one lib file.
16# Filter out objects already built-in
17
18lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
19
20
21# Handle objects in subdirs
22# ---------------------------------------------------------------------------
23# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
24# and add the directory to the list of dirs to descend into: $(subdir-y)
25# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
26# and add the directory to the list of dirs to descend into: $(subdir-m)
27
28__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
29subdir-y += $(__subdir-y)
30__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
31subdir-m += $(__subdir-m)
32obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
33obj-m := $(filter-out %/, $(obj-m))
34
35# Subdirectories we need to descend into
36
37subdir-ym := $(sort $(subdir-y) $(subdir-m))
38
39# if $(foo-objs) exists, foo.o is a composite object
40multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
41multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
42multi-used := $(multi-used-y) $(multi-used-m)
43single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
44
45# Build list of the parts of our composite objects, our composite
46# objects depend on those (obviously)
47multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
48multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
49multi-objs := $(multi-objs-y) $(multi-objs-m)
50
Sam Ravnborgf5fb9762007-09-15 08:55:39 +020051# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
52# tell kbuild to descend
53subdir-obj-y := $(filter %/built-in.o, $(obj-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55# $(obj-dirs) is a list of directories that contain object files
56obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
57
58# Replace multi-part objects by their individual parts, look at local dir only
59real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
60real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
61
62# Add subdir path
63
64extra-y := $(addprefix $(obj)/,$(extra-y))
65always := $(addprefix $(obj)/,$(always))
66targets := $(addprefix $(obj)/,$(targets))
67obj-y := $(addprefix $(obj)/,$(obj-y))
68obj-m := $(addprefix $(obj)/,$(obj-m))
69lib-y := $(addprefix $(obj)/,$(lib-y))
70subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
71real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
72real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
73single-used-m := $(addprefix $(obj)/,$(single-used-m))
74multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
75multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
76multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
77multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
78subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
79obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081# These flags are needed for modversions and compiling, so we define them here
82# already
83# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
84# end up in (or would, if it gets compiled in)
85# Note: It's possible that one object gets potentially linked into more
86# than one module. In that case KBUILD_MODNAME will be set to foo_bar,
87# where foo and bar are the name of the modules.
Ustyugov Romanf83b5e32005-09-23 08:42:11 +040088name-fix = $(subst $(comma),_,$(subst -,_,$1))
Sam Ravnborg5e8d7802006-07-01 09:58:02 +020089basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
Ustyugov Romanf83b5e32005-09-23 08:42:11 +040090modname_flags = $(if $(filter 1,$(words $(modname))),\
91 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Sam Ravnborgf77bf012007-10-15 22:25:06 +020093_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o)
94_a_flags = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o)
95_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97# If building the kernel in a separate objtree expand all occurrences
98# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
99
100ifeq ($(KBUILD_SRC),)
101__c_flags = $(_c_flags)
102__a_flags = $(_a_flags)
103__cpp_flags = $(_cpp_flags)
104else
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106# -I$(obj) locates generated .h files
107# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
108# and locates generated .h files
109# FIXME: Replace both with specific CFLAGS* statements in the makefiles
110__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
111__a_flags = $(call flags,_a_flags)
112__cpp_flags = $(call flags,_cpp_flags)
113endif
114
Sam Ravnborg06c50402007-10-15 22:17:25 +0200115c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 $(__c_flags) $(modkern_cflags) \
Ustyugov Romanf83b5e32005-09-23 08:42:11 +0400117 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Sam Ravnborg06c50402007-10-15 22:17:25 +0200119a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 $(__a_flags) $(modkern_aflags)
121
122cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
123
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200124ld_flags = $(LDFLAGS) $(ldflags-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126# Finds the multi-part object the current object will be linked into
127modname-multi = $(sort $(foreach m,$(multi-used),\
128 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
129
130# Shipped files
131# ===========================================================================
132
133quiet_cmd_shipped = SHIPPED $@
134cmd_shipped = cat $< > $@
135
136$(obj)/%:: $(src)/%_shipped
137 $(call cmd,shipped)
138
139# Commands useful for building a boot image
140# ===========================================================================
141#
142# Use as following:
143#
144# target: source(s) FORCE
145# $(if_changed,ld/objcopy/gzip)
146#
Sam Ravnborg836caba2007-09-30 20:34:36 +0200147# and add target to extra-y so that we know we have to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148# read in the saved command line
149
150# Linking
151# ---------------------------------------------------------------------------
152
153quiet_cmd_ld = LD $@
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200154cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 $(filter-out FORCE,$^) -o $@
156
157# Objcopy
158# ---------------------------------------------------------------------------
159
160quiet_cmd_objcopy = OBJCOPY $@
161cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
162
163# Gzip
164# ---------------------------------------------------------------------------
165
166quiet_cmd_gzip = GZIP $@
167cmd_gzip = gzip -f -9 < $< > $@
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169